?
Solved

Cannot Receive e-mail from POP3 connector

Posted on 2008-06-16
3
Medium Priority
?
475 Views
Last Modified: 2013-11-30
Hello,

We are running exchange 2003 and using Native Pop3 Connector - http://www.mapilab.com/exchange/pop3_connector/ instead of Microsofts POP3 connector to download e-mail off our external e-mail addresses.  Exchange does not serve as our primary e-mail server.  We use Native POP3 connector because it offers smaller intervals of times between checking the inboxes.

Lately however - our exchange server has been the target of some direct and sneaky spam. masquarading as "Undeliverable"

Seeing as our exchange server doesn't (shouldn't) receive emails directly - but instead get e-mails from our offsite e-mail server via pop3,  I disabled anonymous connections in the default smtp virtual server - and whitelisted our offsite e-mail server.

However - I am not receiving e-mails now.  If I send an e-mail from gmail - or other e-mail server, the Offsite server receives the e-mail, the pop3 connector downloads the e-mail - as it it shortly removed from the offsite server, but the e-mail never shows up in my exchange mailbox.  If I enable anonymous authentication to the default smtp virtual server, then the e-mails show up in my exchange mailbox.

What gives?
0
Comment
Question by:kemhof
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 8

Expert Comment

by:Mikkk
ID: 21797889
You can't disable anonymous connections to your SMTP server if your POP connector software is not able to send mails to it via non anonymous connectons.
That is, when you do it, Exchange only allows geting SMTP mails is they are validated with a actyve directory domain user and password.
So, enable anonymous connections (almost all servers has it enabled) or disable it and configure POP Connector to send downloaded mails to Exchange via secure-validated user connection (I supose it will not be able to do it)
0
 
LVL 25

Accepted Solution

by:
kieran_b earned 1500 total points
ID: 21798259
Alternatively, just block port 25 access to your exchange server in the firewall.

Mapilabs POP3 connector is special in that as Mikkk indicated, it actually sends your server the mail - most POP3 connectors don't, they just drop it in the queue and Exchange processes them.

Kieran
0
 

Author Closing Comment

by:kemhof
ID: 31467768
I did not realize that mapilabs POP3 connector delivered e-mails to the exchange store via SMTP.

I solved the situation by allowing anonymous connections - but restricting  connections to a specific list of IP's that can connect to the SMTP virtual server

Thanks for the info
0

Featured Post

Office 365 Training for Admins - 7 Day Trial

Learn how to provision tenants, synchronize on-premise Active Directory, implement Single Sign-On, customize Office deployment, and protect your organization with eDiscovery and DLP policies.  Only from Platform Scholar.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will help to fix the below error for MS Exchange server 2010 I. Out Of office not working II. Certificate error "name on the security certificate is invalid or does not match the name of the site" III. Make Internal URLs and External…
There are times when we need to generate a report on the inbox rules, where users have set up forwarding externally in their mailbox. In this article, I will be sharing a script I wrote to generate the report in CSV format.
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question